Add support for Laravel 6.x and Carbon 2.0

Author: SanderMuller

composer.json

@@ -14,14 +14,14 @@
     "keywords": ["Laravel", "GhostDatabase"],
     "require": {
         "php": "^7.1",
-        "illuminate/support": "~5.4",
-        "illuminate/database": "~5.4",
-        "nesbot/carbon": "1.*",
-        "spatie/laravel-db-snapshots": "~1.1"
+        "illuminate/support": "^5.5|^6.0",
+        "illuminate/database": "^5.5|^6.0",
+        "nesbot/carbon": "^1.26.3 || ^2.0",
+        "spatie/laravel-db-snapshots": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "~6.0",
-        "orchestra/testbench": "~3.0"
+        "phpunit/phpunit": "^6.0|^7.0|^8.0",
+        "orchestra/testbench": "^3.0|^4.0"
     },
     "autoload": {
         "psr-4": {